From 5c7ae10f66eae34b8a786fc2fdf753bf48a3d116 Mon Sep 17 00:00:00 2001 From: Dave Cheney Date: Wed, 6 Apr 2016 15:19:12 +1000 Subject: runtime: merge 64bit lfstack impls Merge all the 64bit lfstack impls into one file, adjust build tags to match. Merge all the comments on the various lfstack implementations for posterity. lfstack_amd64.go can probably be merged, but it is slightly different so that will happen in a followup. Change-Id: I5362d5e127daa81c9cb9d4fa8a0cc5c5e5c2707c Reviewed-on: https://go-review.googlesource.com/21591 Run-TryBot: Dave Cheney Reviewed-by: Brad Fitzpatrick TryBot-Result: Gobot Gobot Reviewed-by: Minux Ma --- src/runtime/lfstack_64bit.go | 35 +++++++++++++++++++++++++++++++++++ src/runtime/lfstack_darwin_arm64.go | 25 ------------------------- src/runtime/lfstack_linux_arm64.go | 25 ------------------------- src/runtime/lfstack_linux_mips64x.go | 32 -------------------------------- src/runtime/lfstack_linux_ppc64x.go | 32 -------------------------------- 5 files changed, 35 insertions(+), 114 deletions(-) create mode 100644 src/runtime/lfstack_64bit.go delete mode 100644 src/runtime/lfstack_darwin_arm64.go delete mode 100644 src/runtime/lfstack_linux_arm64.go delete mode 100644 src/runtime/lfstack_linux_mips64x.go delete mode 100644 src/runtime/lfstack_linux_ppc64x.go (limited to 'src/runtime') diff --git a/src/runtime/lfstack_64bit.go b/src/runtime/lfstack_64bit.go new file mode 100644 index 0000000000..27a058c763 --- /dev/null +++ b/src/runtime/lfstack_64bit.go @@ -0,0 +1,35 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build arm64 mips64 mips64le ppc64 ppc64le + +package runtime + +import "unsafe" + +// On ppc64, Linux limits the user address space to 46 bits (see +// TASK_SIZE_USER64 in the Linux kernel). This has grown over time, +// so here we allow 48 bit addresses. +// +// On mips64, Linux limits the user address space to 40 bits (see +// TASK_SIZE64 in the Linux kernel). This has grown over time, +// so here we allow 48 bit addresses. +// +// In addition to the 16 bits taken from the top, we can take 3 from the +// bottom, because node must be pointer-aligned, giving a total of 19 bits +// of count. +const ( + addrBits = 48 + cntBits = 64 - addrBits + 3 +) + +func lfstackPack(node *lfnode, cnt uintptr) uint64 { + return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<> cntBits << 3))) + cnt = uintptr(val & (1<> cntBits << 3))) - cnt = uintptr(val & (1<> cntBits << 3))) - cnt = uintptr(val & (1<> cntBits << 3))) - cnt = uintptr(val & (1<> cntBits << 3))) - cnt = uintptr(val & (1<